Apparatus for controlling the intensity of a laser beam emitted

Details Apparatus for controlling the intensity of a laser beam emitted Apparatus for controlling the intensity of a laser beam emitted

1990-12-27

1992-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, G01J 132

Patent

active

051591847

ABSTRACT:
In an apparatus for adjusting the intensity of a light beam, a first driving current which is stepwisely increased in a first cycle is supplied to a semiconductor laser. The light beam is deflected to scan a photosensitive drum and is detected to generate a positional signal by a photodetector outside of the drum. The intensity of the light beam is also detected by a monitor detector and compared with a predetermined target intensity. The comparison result is latched in a latch circuit to determine a first drive signal. When the intensity of the light beam reaches the target intensity after the generation of the positional signal, a second drive signal is generated in a second cycle longer than the first cycle instead of the first drive signal and is supplied to the semiconductor laser. The second drive signal is determined in accordance with the comparison result latched in the latch circuit.

REFERENCES:
patent: 4059833 (1977-11-01), Kitamura et al.
patent: 4201994 (1980-05-01), Hoshito et al.
patent: 4443695 (1984-04-01), Kitamura
patent: 4695714 (1987-09-01), Kimizuka et al.
patent: 4845358 (1989-07-01), Asada
patent: 4853710 (1989-08-01), Shimada et al.
patent: 4855988 (1989-08-01), Shinbayashi et al.
patent: 4935615 (1990-06-01), Yoshida Eiichi et al.

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